Question

The co-ordinates of a point on the parabola $y^2=8x$ whose focal distance is 4 is

• A. $0,2$
• B. $2,1$
• C. $(-3,\frac{-71}{10})$
• D. $2,-1$

Answer 1

The correct option is B $2,1$

Focal distance of a point (x,y) on the parabola $y^2=4ax$ is given by x+a
$a+x=4\Rightarrow 2+x=4\Rightarrow x=2,y=4$